Improvement in machines for nicking screw-blanks



W. AIKEN. Machines fur-N-icki-ng Screw-Blanks;

Patented May Fig.1

Tag. 3.

WaZzerJ/wn.

W6 znesziea STATES PATENT lOrrroa WALTER AIKEN, OF FRANKLIN, NEW HAMPSHIRE.

IMPROVEMENTlN MACHINES FOR NICKING S'CREW-BIJANK S'.

Specification forming part of Letters Patent No. 150,667, dated May 12, 1874; application filed April 1, 1874.

To all whom it may concern:

Be it known that I, WALTER AIKEN, of Franklin, in the county of Merrimack and State of New Hampshire, have invented a new and useful Improvement in Machinery for Nicking Screws or Screw-Blanks; and do hereby declare the same to be fully described in the following specification and represented in the accompanying drawings, of which- Figure l is a top view, Fig. 2 a front elevation, Fig. 3 a longitudinal section, and Fig. 4 a transverse section, of a machine having my invention, which especially relates to mechanism for feeding the screw-blanks successively from a reservoir, and holding each of them while being nicked.

In these drawings, A denotes a reservoir for receiving the screw blanks and supplying them successively to the mechanism for holding each of them while being nicked or sawed diametrically across its head. The said receiver A is stationary, and has arranged below it, as shown, two slide-bars, B G,which, disposed in range with each other, have their inner ends notched, as seen at a a, to receive and hold a screw-blank by its shank. These bars B O sliderectilinearly in two standards,

D E, erected on a base, F. A helical'spring,

G, attached at one end to the base F and at the other to a projection, 11, from the bar B, serves to retract such bar, a cam,H, fixed on a driving-shaft, I, being employed to advance the bar, or, in fact, both of said bars B O simultaneously. Anothersuch spring, K, is fastened at one end to the base F and at the other to an arm, 0, extended from the slide 0. The arm is projected in front of the end of a third slide-bar, L, arranged in another stand:

ard, M, and provided with a stop, 01, to limit its rearward movement in the standard. A cam, N, fixed on the driving-shaftI serves to advance the slide, and also to retain it sta tionary for a short period of time, for the purpose of causing it to hold the slide at rest, in order that the bar B may be retracted from it to enable a screw-blank, after having been nicked, to fall from between the two bars B and O. A cam, O, fixed on the top of the standard M, and extended underneath the fountain or screwblank receiver A, and formed as shown, serves, while a blank is being moved into line with the nicking-saw P, to advance the blank or push it longitudinally forward between the two bars B ,0, and also to hold it from sliding backward while the saw P may be in operation upon it. The circular saw P has its arbor Q supported by a vibratory frame, B, pivoted to the base, and provided with a retractive spring, S. A lever, T, arranged as shown, has .a screw, f, passing through its front arm and against the sawframe It. The other arm of this lever bears against acam, U, fixed on the shaft I. Furth ermore, there is a screw, V, which screws through a post, W, erected on the base in advance of the slide 0. The screw is to limit and regulate the advance of the said slide, which brings up against the inner end of the screw.

The cam H should be so made as to allow the bar B, after the bar 0 may have fallen back to its rearmost position, to move a short distance away from such bar 0, or far enough for a screw-blank to fall from the receiver into the notches a a. This having taken place, the cam, continuing to revolve, will advance the bar 0 up to the blank, so as to hold it against the said bar B, and simultaneously advance both bars and the blank. While the blank may be thus moved its point will be forced against the inner edge of the stationary cam 0, whereby the blank, as soon as it may have advanced beyond the receiver will be moved longitudinally toward the saw. On

the blank having attained its proper position for being nicked, the saw will be advanced, and, being put in revolution by a belt running around a pulley, 7c, fixed on its arbor, it will nick the head of the screw. In the meantime the stop-bar L will have been advanced up to the arm 0, in order to hold the bar 0 stationary for a short period during the retreat of the bar B, or long enough for the screw-blank to be released from the grasp of the two bars and'to fall away from them. On this having taken place, the cam N will allow the stop-bar to be drawn backward with the slide 0 by the retractive spring of the latter.

What I claim as my invention is 1. The screw V and its post W, arranged and combined as described, with slide-bars B 0, provided with the retractive springs G K, cam H, the stop-bar L, and its cam N, and arranged with the receiver A and the cam O, in manner and to operate therewith as and for the purpose specified.

2. The combination of the blank-receiver A and the saw P, provided with mechanism for operating it, as described, with the mechanism, as specified, for feeding'or successively removing the screw-blanks from the receiver,

retractive springs G K, cams H, O, and N, and

stop-bar L, all applied and arranged as explained.

WALTER AIKEN. Witnesses:

R. H. EDDY, J. R. SNOW. 

